Page 41 - Analysis Report of Global Market in the Submarine Cable Field (2017)

Research on the key technologies of large length and

deep-sea repeated submarine optical fiber cable

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1
Hu Ming , Xie Shuhong , lixuesong , Xue Jianling 1
1
1. ZTT Submarine Cable Limited Company, Nantong, 226010;
2. Jiangsu ZTT Limited Company, Nantong, 226463
Abstract: Submarine optical fiber cable and connection joint asremoting power supply and transferring information line carrier to submarine
repeatered communication system and submarine observation system, it has the characteristics of large length, high water depth, high power,
photoelectric integration and soon on, repeatered submarine system application environment water depth has arrived 4500m, observation net
system operating voltage has also increased to 10kv. This paper analyzes on repeatered submarine optical fiber cable high water pressure, insulation
performance under high voltage, simulation calculation of submarine optical fiber cable electric field distribution, line new type U J joint box and
larger length online transition scheme to technologic research.
Key words: Submarine optical fiber cable, repeatered, submarine observation network, UJ joint.
1.Introduction joint box technology for large length and deep- sea repeatered submarine
Submarine optical fiber cable is submarine communication system’s optical fiber cable in the condition of high water pressure, high voltage
main transmission medium, it has the excellent characteristics of and high power.
transmission stability, low attenuation, wide band width, large capacity,
repeater long distance, good secrecy, light weight and small outer 2.Research on submarine optical fiber cable insulation technology
diameter. Submarine optical fiber cable has become an important Large length and deep- sea repeatered submarine optical fiber cable
carrier of international communication and transoceanic connection, its products has been divided into light weight (LW), light weight
international communication business has been increasing year by year, production (LWP), single steel wire armoring (SA), double steel wire
which has exceeded the satellite communication business and became the armoring (DA) structure, its corresponding working water depth is
main force of modern internal communication. As an important means reduced in turn, the deeper the area, the more stable the seabed is, the
of contemporary international communication, submarine optical fiber greater the structure tension is, the lighter the weight of the deep-sea
cable is responsible for 90% of international communication business. cable is. Affected by the ship anchoring, water flow and so on, the area of
The special submarine environment has raised a higher requirement shallow water requires a double steel wire armoring, the typical structure
for submarine optical fiber system (especially in deep-sea repeatered diagrams are as follow figure one.
submarine optical fiber system). The higher application water depth, Figure 1:Typical structureof repeatered submarine optical fiber cable
harsh environment, submarine optical fiber product includes developing,
producing, constructing and maintaining and so on some other more
link, every link needs special technique and equipment, the reliability of
the product is very high.

Submarine observation net system mainly consists of the coast
station, submarine optical fiber cable, submarine monitor equipment,
submarine optical fiber cable is a main part of constituting Submarine
observation net and has used to connect coastal base station and
submarine monitoring equipment. “ Outline of the internal long- term
science and technology development plan (From Year 2006 to 2010 )”
has listed marine technology one of eight cutting- edge technologies, at
the same time, it use marine environmental monitoring technology as
one of the four important marine technologies. Submarine observation
net can carry on a wide range of Marine, stereo, continuous, long- Submarine optical fiber cable uses laser to bond stainless steel tube
term, real- time monitoring and analysis, it has great scientific and fiber unit and strands by unequal diameter high-strength steel wire
social significance in marine scientific research, marine forecasts, (synchronously filling with water resistance material and copper pipe
marine resources development, the earth’s environment monitoring welding) as an integrated copper tube inner conductor, the outer
and protection, earthquake and tsunami and other natural disasters’ insulation layer is extruded to the conductor in the copper tube trough
monitoring and early warning and national defense security. the adhesive layer, to constitute the LW submarine optical fiber cable
which is suitable for deep-sea repeatered system, the difficulty of the
In order to meet the requirement of using environments and applying insulation technology is the insulation layer of polyethylene material also
systems, large length, deep-sea repeatered submarine optical fiber cable undertake the effect of water resistance layer and outer protective layer,
products has the characteristics of compact structure, high strength, the insulation layer will directly contact the seawater, the seawater will
high watertight and have the capability to continuously product within seep into the insulation layer and result in the reduction of the insulation
hundreds meters, it is the most technologically advanced products in the layer breakdown strength, the insulation material which is suitable for
submarine cable area. At present, only a few companies in the word can the deep-sea repeatered submarine optical fiber cable not only have the
enter this field. Limited by the conditions of the deep- sea, the submarine high direct current breakdown strength, but also have the strong water
optical fiber cable insulation layer has taken the effect of protective layer resistance infiltration ability. In addition, system adopts high voltage
and waterproof layer, polyethylene insulation under the storage structure direct current transmission methods, under the direct current field, field
progress of bending, friction and tension, it needs to be long- term used strength distribution distribute as the inverse of the conductivity of the
in the requirement of high pressure and high voltage, it’s necessary to material, once the seawater invade in the insulation, the conductivity
further study the insulating performance key technology and matching of insulation will increase, the field intensity distribution will change.
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